Datasheet

n Indicates how much memory to display (in u units), default = 1

f Indicates the display format, where:

s means null-terminated string

i means machine instruction

x Display as hexadecimal (default)

d Display as signed decimal

u Display as unsigned decimal

c Print as a char constant

f Print in floating point syntax

t Print integer as binary

u The unit size, which can be:

b Bytes

h Halfwords (two bytes)

w Words (four bytes)

g Giant worlds (eight bytes)

> Note: Whenever you change the unit size ( u ), the updated value becomes

> the system default and will be retained on future requests until it is

> changed again.

For example, to display the same 32-bit stack pointer at address 0 on an ARM

processor as four individual bytes displayed as unsigned decimal values you

would enter:

(gdb) x/4ub 0

0x0: 0 128 0 32

To display the 32-bit value in binary notation you would enter:

(gdb) x/4tb 0

0x0: 00000000 10000000 00000000 00100000

To display 4 'words' as 32-bit values in hex notation:

(gdb) x/4xw 0

0x0: 0x20008000 0x00003049 0x00003099 0x00003099

Stack Manipulation

The following commands can be used to work with the stack such as producing a

dump of the stack frames, or checking for stack overflow.

Display the Stack Trace

You can display a list of function calls up to the point where the MCU halted

with the backtrace or bt command, which will dump individual stack

frame records: